Materials Literature
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The thermal degradation of wood treated with basic nitrogen compounds and phosphoric acid was studied in air and nitrogen by differential thermal analysis and thermogravimetry from ambient temperature to 650°C. From the resulting data, kinetic parameters for different stages of thermal degradation were obtained follow…
Random parallel nanostructures (ridges and channels) were created by scratching gold thin films deposited on glass slides. Atomic force microscope (AFM) images showed that the width of the substructures within the scratches were of the order of a few hundred nanometers. These nanometric gold features can then support…
The paper present the synthesis of a series of nylons as constituent polymers of parts obtained by rotational molding via activated anionic copolymerization of caprolactam with laurolactam. The initial mold temperature (initial polymerization temperature) was kept constant at 160° for all experiments. The initial laur…
Abstract Fe-rich smectites from lateritic weathering profiles have previously been studied by XRD, ICP-AES, SEM-EDX and TEM-EDX analyses (Gaudin et al ., 2004). These smectites exhibit intermediate chemistries between five end-members: Al-Fe beidellites, Al-Fe montmorillonites and Mg+Ni-saponite. The spectroscopic stu…
Two novel homoleptic diazaporphyrinato lanthanide sandwich com-plexes M(2)(DAP)(3) [M = Ce (1), Eu (2); DAP= 2,8,12,18-tetra-ethyl-3,7,13,17-tetramethyl-5,15-diazaporphyrinate] were synthesized by a one-pot reaction of the corresponding M(acac)(3).nH(2)O (acac = acetylacetonate) with metal-free D(2)(h) type diazaporph…
Abstract The crystallographic nature of modular structures is analysed and discussed in terms of their symmetry and structure building operations. The modular crystal structures we discuss in this paper are homogeneous edifices, built by one or more types of modules related by a point-space operation, and the whole st…
Abstract Rigid PVC/wood‐flour composite lumber containing either hardwood (maple) or a softwood (southern pine) wood flour at different levels of wood‐flour content was evaluated for susceptibility to fungal colonization and discoloration by using standard tests that mimicked exterior (ASTM G21) and interior (ASTM D32…
Nanocrystalline 4‐mol%‐Sc 2 O 3 ‐stabilized zirconia (4ScSZ) and 4‐mol%‐Y 2 O 3 ‐stabilized zirconia (4YSZ) powders were prepared by a mild urea‐based hydrothermal method. The as‐prepared 4ScSZ and 4YSZ powders behaved with different tetragonal–monoclinic ( t – m ) transitions on calcination at temperatures between 40…
The combined effect of rapid sintering by spark‐plasma‐sintering (SPS) technique and mechanical milling of γ‐Al 2 O 3 nanopowder via high‐energy ball milling (HEBM) on the microstructural development and mechanical properties of nanocrystalline alumina matrix composites toughened by 20 vol% silicon carbide whiskers wa…
Shape memory alloys (SMA) have generated a lot of new ideas in engineering. Application is however so far limited in the field of civil engineering. Sensing and actuation properties of SMA can be applied into civil infrastructures to improve structural performance. This paper presents an integrated self-diagnostic and…
Abstract A new method of investigating the kinetic parameters and mechanism functions of a solid phase reaction is presented. This method is to analyze the data based on the use of these data at the same temperature and the same degree of conversion on a series of TA curves with different heating rates, so that the ki…
13 C NMR relaxation measurements were performed on two series of miscible polymer blends: entangled polybutadiene (PB) in perdeuterated oligomeric poly(vinyl ethylene) and entangled poly(vinyl ethylene) (PVE) in perdeuterated oligomeric polybutadiene. A wide range of temperatures (∼ T g + 50 K to T g + 200 K) and seve…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSurfactant-Induced Crystallization of PolycarbonateP. R. Sundararajan, Shanti Singh, and M. MoniruzzamanView Author Information Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada Cite this: Macromolecules 2004, 37, 26, 10208–102…
L-Colitose is a 3,6-dideoxyhexose found in the O-antigen of Gram-negative lipopolysaccharides. To study the biosynthesis of this unusual sugar, we have cloned and sequenced the L-colitose biosynthetic gene cluster from Yersinia pseudotuberculosis VI. The colD and colC genes in this cluster have been overexpressed and…
Effects of nitrogen on the repassivation behavior of Type 304L (UNS S30403) alloy in a sodium chloride (NaCl) solution at 25°C were investigated using a rapid scratched-electrode technique. The repassivation rate was faster in the alloy with nitrogen (0.1 wt%) than the alloy without nitrogen. Irrespective of their rep…
Abstract We present a method in which the contributions from the individual crystallites in a polycrystalline sample are separated and treated as essentially single crystal data sets. The process involves the simultaneous determination of the orientation matrices of the individual crystallites in the sample, the subse…
Photoinduced charge separation and recombination in a carotenoid-porphyrin-fullerene triad C-P-C(60)(1) have been followed by multifrequency time-resolved electron paramagnetic resonance (TREPR) at intermediate magnetic field and microwave frequency (X-band) and high field and frequency (W-band). The electron-transfer…
The acidic microclimate pH (μpH) in poly(lactide- co -glycolide) (PLGA) devices has been identified as a major source of instability of encapsulated proteins and acid labile small molecules. A fast and reliable potentiometric technique for μpH measurement in thin PLGA films was developed and validated. Standard glass…
The luminescence enhancement effect of different kinds and contents of rare earth complexe (RE(DBM)3Phen, RE = Dy, La, Gd, Sm, Y; DBM = dibenzoylmethane; Phen = 1,10-phenanthroline) sensitized Eu(DBM)3Phen doped in poly(methyl methacrylate) (PMMA) matrix was investigated using the combinatorial method. The efficiency…
Laser-ablated Ca, Sr, and Ba atoms were co-deposited with H 2 in excess argon, neon, and hydrogen to form alkaline-earth metal hydrides. The metal dihydrides (CaH 2, SrH 2, and BaH 2 ) were identified in solid argon, neon, and hydrogen. Increasing infrared intensity in the symmetric stretching mode and electronic stru…